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source: palm/trunk/SOURCE/lpm_init_mod.f90 @ 1867

Last change on this file since 1867 was 1851, checked in by maronga, 9 years ago
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[1850]	1	!> @file lpm_init_mod.f90
[1036]	2	!--------------------------------------------------------------------------------!
	3	! This file is part of PALM.
	4	!
	5	! PALM is free software: you can redistribute it and/or modify it under the terms
	6	! of the GNU General Public License as published by the Free Software Foundation,
	7	! either version 3 of the License, or (at your option) any later version.
	8	!
	9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	12	!
	13	! You should have received a copy of the GNU General Public License along with
	14	! PALM. If not, see <http://www.gnu.org/licenses/>.
	15	!
[1818]	16	! Copyright 1997-2016 Leibniz Universitaet Hannover
[1036]	17	!--------------------------------------------------------------------------------!
	18	!
[254]	19	! Current revisions:
[1]	20	! -----------------
[1851]	21	!
	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: lpm_init_mod.f90 1851 2016-04-08 13:32:50Z raasch $
	26	!
[1851]	27	! 1850 2016-04-08 13:29:27Z maronga
	28	! Module renamed
	29	!
	30	!
[1832]	31	! 1831 2016-04-07 13:15:51Z hoffmann
	32	! curvature_solution_effects moved to particle_attributes
	33	!
[1823]	34	! 1822 2016-04-07 07:49:42Z hoffmann
	35	! Unused variables removed.
	36	!
[1784]	37	! 1783 2016-03-06 18:36:17Z raasch
	38	! netcdf module added
	39	!
[1726]	40	! 1725 2015-11-17 13:01:51Z hoffmann
	41	! Bugfix: Processor-dependent seed for random function is generated before it is
	42	! used.
	43	!
[1692]	44	! 1691 2015-10-26 16:17:44Z maronga
	45	! Renamed prandtl_layer to constant_flux_layer.
	46	!
[1686]	47	! 1685 2015-10-08 07:32:13Z raasch
	48	! bugfix concerning vertical index offset in case of ocean
	49	!
[1683]	50	! 1682 2015-10-07 23:56:08Z knoop
	51	! Code annotations made doxygen readable
	52	!
[1576]	53	! 1575 2015-03-27 09:56:27Z raasch
	54	! initial vertical particle position is allowed to follow the topography
	55	!
[1360]	56	! 1359 2014-04-11 17:15:14Z hoffmann
	57	! New particle structure integrated.
	58	! Kind definition added to all floating point numbers.
	59	! lpm_init changed form a subroutine to a module.
	60	!
[1329]	61	! 1327 2014-03-21 11:00:16Z raasch
	62	! -netcdf_output
	63	!
[1323]	64	! 1322 2014-03-20 16:38:49Z raasch
	65	! REAL functions provided with KIND-attribute
	66	!
[1321]	67	! 1320 2014-03-20 08:40:49Z raasch
[1320]	68	! ONLY-attribute added to USE-statements,
	69	! kind-parameters added to all INTEGER and REAL declaration statements,
	70	! kinds are defined in new module kinds,
	71	! revision history before 2012 removed,
	72	! comment fields (!:) to be used for variable explanations added to
	73	! all variable declaration statements
	74	! bugfix: #if defined( __parallel ) added
[850]	75	!
[1315]	76	! 1314 2014-03-14 18:25:17Z suehring
	77	! Vertical logarithmic interpolation of horizontal particle speed for particles
	78	! between roughness height and first vertical grid level.
	79	!
[1093]	80	! 1092 2013-02-02 11:24:22Z raasch
	81	! unused variables removed
	82	!
[1037]	83	! 1036 2012-10-22 13:43:42Z raasch
	84	! code put under GPL (PALM 3.9)
	85	!
[850]	86	! 849 2012-03-15 10:35:09Z raasch
[849]	87	! routine renamed: init_particles -> lpm_init
	88	! de_dx, de_dy, de_dz are allocated here (instead of automatic arrays in
	89	! advec_particles),
	90	! sort_particles renamed lpm_sort_arrays, user_init_particles renamed lpm_init
[392]	91	!
[829]	92	! 828 2012-02-21 12:00:36Z raasch
	93	! call of init_kernels, particle feature color renamed class
	94	!
[826]	95	! 824 2012-02-17 09:09:57Z raasch
	96	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3,
	97	! array particles implemented as pointer
	98	!
[668]	99	! 667 2010-12-23 12:06:00Z suehring/gryschka
	100	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
	101	! of arrays.
	102	!
[1]	103	! Revision 1.1 1999/11/25 16:22:38 raasch
	104	! Initial revision
	105	!
	106	!
	107	! Description:
	108	! ------------
[1682]	109	!> This routine initializes a set of particles and their attributes (position,
	110	!> radius, ..) which are used by the Lagrangian particle model (see lpm).
[1]	111	!------------------------------------------------------------------------------!
[1682]	112	MODULE lpm_init_mod
	113
[1]	114
[1320]	115	USE arrays_3d, &
	116	ONLY: de_dx, de_dy, de_dz, zu, zw, z0
	117
	118	USE control_parameters, &
[1691]	119	ONLY: cloud_droplets, constant_flux_layer, current_timestep_number, &
[1783]	120	dz, initializing_actions, message_string, ocean, simulated_time
[1320]	121
	122	USE grid_variables, &
[1359]	123	ONLY: ddx, dx, ddy, dy
[1320]	124
	125	USE indices, &
[1575]	126	ONLY: nx, nxl, nxlg, nxrg, nxr, ny, nyn, nys, nyng, nysg, nz, nzb, &
	127	nzb_w_inner, nzt
[1320]	128
	129	USE kinds
	130
	131	USE lpm_collision_kernels_mod, &
	132	ONLY: init_kernels
	133
[1783]	134	USE netcdf_interface, &
	135	ONLY: netcdf_data_format
	136
[1320]	137	USE particle_attributes, &
[1359]	138	ONLY: alloc_factor, bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
	139	block_offset, block_offset_def, collision_kernel, &
[1831]	140	curvature_solution_effects, &
[1822]	141	density_ratio, grid_particles, &
[1359]	142	initial_weighting_factor, ibc_par_b, ibc_par_lr, ibc_par_ns, &
	143	ibc_par_t, iran_part, log_z_z0, &
	144	max_number_of_particle_groups, maximum_number_of_particles, &
[1822]	145	min_nr_particle, mpi_particle_type, &
	146	number_of_particles, &
[1320]	147	number_of_particle_groups, number_of_sublayers, &
[1822]	148	offset_ocean_nzt, offset_ocean_nzt_m1, &
[1359]	149	particles, particle_advection_start, particle_groups, &
	150	particle_groups_type, particles_per_point, &
[1822]	151	particle_type, pdx, pdy, pdz, &
[1359]	152	prt_count, psb, psl, psn, psr, pss, pst, &
[1320]	153	radius, random_start_position, read_particles_from_restartfile,&
[1822]	154	seed_follows_topography, sort_count, &
	155	total_number_of_particles, &
	156	use_sgs_for_particles, &
[1359]	157	write_particle_statistics, uniform_particles, zero_particle, &
	158	z0_av_global
[1320]	159
[1]	160	USE pegrid
	161
[1320]	162	USE random_function_mod, &
	163	ONLY: random_function
[1]	164
[1359]	165	IMPLICIT NONE
[1320]	166
[1359]	167	PRIVATE
	168
[1682]	169	INTEGER(iwp), PARAMETER :: PHASE_INIT = 1 !<
	170	INTEGER(iwp), PARAMETER, PUBLIC :: PHASE_RELEASE = 2 !<
[1359]	171
	172	INTERFACE lpm_init
	173	MODULE PROCEDURE lpm_init
	174	END INTERFACE lpm_init
	175
	176	INTERFACE lpm_create_particle
	177	MODULE PROCEDURE lpm_create_particle
	178	END INTERFACE lpm_create_particle
	179
	180	PUBLIC lpm_init, lpm_create_particle
	181
	182	CONTAINS
	183
[1682]	184	!------------------------------------------------------------------------------!
	185	! Description:
	186	! ------------
	187	!> @todo Missing subroutine description.
	188	!------------------------------------------------------------------------------!
[1359]	189	SUBROUTINE lpm_init
	190
	191	USE lpm_collision_kernels_mod, &
	192	ONLY: init_kernels
	193
[1]	194	IMPLICIT NONE
	195
[1682]	196	INTEGER(iwp) :: i !<
	197	INTEGER(iwp) :: j !<
	198	INTEGER(iwp) :: k !<
[1320]	199
[1]	200	#if defined( __parallel )
[1682]	201	INTEGER(iwp), DIMENSION(3) :: blocklengths !<
	202	INTEGER(iwp), DIMENSION(3) :: displacements !<
	203	INTEGER(iwp), DIMENSION(3) :: types !<
[1]	204	#endif
	205
[1682]	206	REAL(wp) :: height_int !<
	207	REAL(wp) :: height_p !<
	208	REAL(wp) :: z_p !<
	209	REAL(wp) :: z0_av_local !<
[1]	210
	211	#if defined( __parallel )
	212	!
	213	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
[82]	214	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
[1359]	215	blocklengths(1) = 19; blocklengths(2) = 6; blocklengths(3) = 1
	216	displacements(1) = 0; displacements(2) = 152; displacements(3) = 176
	217
[1]	218	types(1) = MPI_REAL
	219	types(2) = MPI_INTEGER
	220	types(3) = MPI_UB
	221	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
	222	mpi_particle_type, ierr )
	223	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
	224	#endif
	225
	226	!
[150]	227	!-- In case of oceans runs, the vertical index calculations need an offset,
	228	!-- because otherwise the k indices will become negative
	229	IF ( ocean ) THEN
	230	offset_ocean_nzt = nzt
	231	offset_ocean_nzt_m1 = nzt - 1
	232	ENDIF
	233
[1359]	234	!
	235	!-- Define block offsets for dividing a gridcell in 8 sub cells
[150]	236
[1359]	237	block_offset(0) = block_offset_def (-1,-1,-1)
	238	block_offset(1) = block_offset_def (-1,-1, 0)
	239	block_offset(2) = block_offset_def (-1, 0,-1)
	240	block_offset(3) = block_offset_def (-1, 0, 0)
	241	block_offset(4) = block_offset_def ( 0,-1,-1)
	242	block_offset(5) = block_offset_def ( 0,-1, 0)
	243	block_offset(6) = block_offset_def ( 0, 0,-1)
	244	block_offset(7) = block_offset_def ( 0, 0, 0)
[150]	245	!
[1]	246	!-- Check the number of particle groups.
	247	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
[274]	248	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
	249	max_number_of_particle_groups , &
[254]	250	'&number_of_particle_groups reset to ', &
	251	max_number_of_particle_groups
[849]	252	CALL message( 'lpm_init', 'PA0213', 0, 1, 0, 6, 0 )
[1]	253	number_of_particle_groups = max_number_of_particle_groups
	254	ENDIF
	255
	256	!
	257	!-- Set default start positions, if necessary
[1359]	258	IF ( psl(1) == 9999999.9_wp ) psl(1) = -0.5_wp * dx
	259	IF ( psr(1) == 9999999.9_wp ) psr(1) = ( nx + 0.5_wp ) * dx
	260	IF ( pss(1) == 9999999.9_wp ) pss(1) = -0.5_wp * dy
	261	IF ( psn(1) == 9999999.9_wp ) psn(1) = ( ny + 0.5_wp ) * dy
	262	IF ( psb(1) == 9999999.9_wp ) psb(1) = zu(nz/2)
	263	IF ( pst(1) == 9999999.9_wp ) pst(1) = psb(1)
[1]	264
[1359]	265	IF ( pdx(1) == 9999999.9_wp .OR. pdx(1) == 0.0_wp ) pdx(1) = dx
	266	IF ( pdy(1) == 9999999.9_wp .OR. pdy(1) == 0.0_wp ) pdy(1) = dy
	267	IF ( pdz(1) == 9999999.9_wp .OR. pdz(1) == 0.0_wp ) pdz(1) = zu(2) - zu(1)
[1]	268
	269	DO j = 2, number_of_particle_groups
[1359]	270	IF ( psl(j) == 9999999.9_wp ) psl(j) = psl(j-1)
	271	IF ( psr(j) == 9999999.9_wp ) psr(j) = psr(j-1)
	272	IF ( pss(j) == 9999999.9_wp ) pss(j) = pss(j-1)
	273	IF ( psn(j) == 9999999.9_wp ) psn(j) = psn(j-1)
	274	IF ( psb(j) == 9999999.9_wp ) psb(j) = psb(j-1)
	275	IF ( pst(j) == 9999999.9_wp ) pst(j) = pst(j-1)
	276	IF ( pdx(j) == 9999999.9_wp .OR. pdx(j) == 0.0_wp ) pdx(j) = pdx(j-1)
	277	IF ( pdy(j) == 9999999.9_wp .OR. pdy(j) == 0.0_wp ) pdy(j) = pdy(j-1)
	278	IF ( pdz(j) == 9999999.9_wp .OR. pdz(j) == 0.0_wp ) pdz(j) = pdz(j-1)
[1]	279	ENDDO
	280
	281	!
[849]	282	!-- Allocate arrays required for calculating particle SGS velocities
[1822]	283	IF ( use_sgs_for_particles .AND. .NOT. cloud_droplets ) THEN
[849]	284	ALLOCATE( de_dx(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	285	de_dy(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	286	de_dz(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	287	ENDIF
	288
	289	!
[1314]	290	!-- Allocate array required for logarithmic vertical interpolation of
	291	!-- horizontal particle velocities between the surface and the first vertical
	292	!-- grid level. In order to avoid repeated CPU cost-intensive CALLS of
	293	!-- intrinsic FORTRAN procedure LOG(z/z0), LOG(z/z0) is precalculated for
	294	!-- several heights. Splitting into 20 sublayers turned out to be sufficient.
	295	!-- To obtain exact height levels of particles, linear interpolation is applied
	296	!-- (see lpm_advec.f90).
[1691]	297	IF ( constant_flux_layer ) THEN
[1314]	298
	299	ALLOCATE ( log_z_z0(0:number_of_sublayers) )
	300	z_p = zu(nzb+1) - zw(nzb)
	301
	302	!
	303	!-- Calculate horizontal mean value of z0 used for logartihmic
	304	!-- interpolation. Note: this is not exact for heterogeneous z0.
	305	!-- However, sensitivity studies showed that the effect is
	306	!-- negligible.
	307	z0_av_local = SUM( z0(nys:nyn,nxl:nxr) )
[1359]	308	z0_av_global = 0.0_wp
[1314]	309
[1320]	310	#if defined( __parallel )
[1314]	311	CALL MPI_ALLREDUCE(z0_av_local, z0_av_global, 1, MPI_REAL, MPI_SUM, &
	312	comm2d, ierr )
[1320]	313	#else
	314	z0_av_global = z0_av_local
	315	#endif
[1314]	316
	317	z0_av_global = z0_av_global / ( ( ny + 1 ) * ( nx + 1 ) )
	318	!
	319	!-- Horizontal wind speed is zero below and at z0
[1359]	320	log_z_z0(0) = 0.0_wp
[1314]	321	!
	322	!-- Calculate vertical depth of the sublayers
[1322]	323	height_int = ( z_p - z0_av_global ) / REAL( number_of_sublayers, KIND=wp )
[1314]	324	!
	325	!-- Precalculate LOG(z/z0)
[1359]	326	height_p = 0.0_wp
[1314]	327	DO k = 1, number_of_sublayers
	328
	329	height_p = height_p + height_int
	330	log_z_z0(k) = LOG( height_p / z0_av_global )
	331
	332	ENDDO
	333
	334
	335	ENDIF
	336
	337	!
[1359]	338	!-- Check boundary condition and set internal variables
	339	SELECT CASE ( bc_par_b )
	340
	341	CASE ( 'absorb' )
	342	ibc_par_b = 1
	343
	344	CASE ( 'reflect' )
	345	ibc_par_b = 2
	346
	347	CASE DEFAULT
	348	WRITE( message_string, * ) 'unknown boundary condition ', &
	349	'bc_par_b = "', TRIM( bc_par_b ), '"'
	350	CALL message( 'lpm_init', 'PA0217', 1, 2, 0, 6, 0 )
	351
	352	END SELECT
	353	SELECT CASE ( bc_par_t )
	354
	355	CASE ( 'absorb' )
	356	ibc_par_t = 1
	357
	358	CASE ( 'reflect' )
	359	ibc_par_t = 2
	360
	361	CASE DEFAULT
	362	WRITE( message_string, * ) 'unknown boundary condition ', &
	363	'bc_par_t = "', TRIM( bc_par_t ), '"'
	364	CALL message( 'lpm_init', 'PA0218', 1, 2, 0, 6, 0 )
	365
	366	END SELECT
	367	SELECT CASE ( bc_par_lr )
	368
	369	CASE ( 'cyclic' )
	370	ibc_par_lr = 0
	371
	372	CASE ( 'absorb' )
	373	ibc_par_lr = 1
	374
	375	CASE ( 'reflect' )
	376	ibc_par_lr = 2
	377
	378	CASE DEFAULT
	379	WRITE( message_string, * ) 'unknown boundary condition ', &
	380	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
	381	CALL message( 'lpm_init', 'PA0219', 1, 2, 0, 6, 0 )
	382
	383	END SELECT
	384	SELECT CASE ( bc_par_ns )
	385
	386	CASE ( 'cyclic' )
	387	ibc_par_ns = 0
	388
	389	CASE ( 'absorb' )
	390	ibc_par_ns = 1
	391
	392	CASE ( 'reflect' )
	393	ibc_par_ns = 2
	394
	395	CASE DEFAULT
	396	WRITE( message_string, * ) 'unknown boundary condition ', &
	397	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
	398	CALL message( 'lpm_init', 'PA0220', 1, 2, 0, 6, 0 )
	399
	400	END SELECT
	401
	402	!
[828]	403	!-- Initialize collision kernels
	404	IF ( collision_kernel /= 'none' ) CALL init_kernels
	405
	406	!
[1]	407	!-- For the first model run of a possible job chain initialize the
[849]	408	!-- particles, otherwise read the particle data from restart file.
[1]	409	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
	410	.AND. read_particles_from_restartfile ) THEN
	411
[849]	412	CALL lpm_read_restart_file
[1]	413
	414	ELSE
	415
	416	!
	417	!-- Allocate particle arrays and set attributes of the initial set of
	418	!-- particles, which can be also periodically released at later times.
[1359]	419	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
	420	grid_particles(nzb+1:nzt,nys:nyn,nxl:nxr) )
[1]	421
[1359]	422	maximum_number_of_particles = 0
	423	number_of_particles = 0
[792]	424
	425	sort_count = 0
[1359]	426	prt_count = 0
[792]	427
[1]	428	!
	429	!-- Initialize all particles with dummy values (otherwise errors may
	430	!-- occur within restart runs). The reason for this is still not clear
	431	!-- and may be presumably caused by errors in the respective user-interface.
[1359]	432	zero_particle = particle_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
	433	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
	434	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
	435	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0, 0, 0, &
	436	0, .FALSE., -1)
[1822]	437
[1359]	438	particle_groups = particle_groups_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp )
[1]	439
	440	!
	441	!-- Set values for the density ratio and radius for all particle
	442	!-- groups, if necessary
[1359]	443	IF ( density_ratio(1) == 9999999.9_wp ) density_ratio(1) = 0.0_wp
	444	IF ( radius(1) == 9999999.9_wp ) radius(1) = 0.0_wp
[1]	445	DO i = 2, number_of_particle_groups
[1359]	446	IF ( density_ratio(i) == 9999999.9_wp ) THEN
[1]	447	density_ratio(i) = density_ratio(i-1)
	448	ENDIF
[1359]	449	IF ( radius(i) == 9999999.9_wp ) radius(i) = radius(i-1)
[1]	450	ENDDO
	451
	452	DO i = 1, number_of_particle_groups
[1359]	453	IF ( density_ratio(i) /= 0.0_wp .AND. radius(i) == 0 ) THEN
[254]	454	WRITE( message_string, * ) 'particle group #', i, 'has a', &
	455	'density ratio /= 0 but radius = 0'
[849]	456	CALL message( 'lpm_init', 'PA0215', 1, 2, 0, 6, 0 )
[1]	457	ENDIF
	458	particle_groups(i)%density_ratio = density_ratio(i)
	459	particle_groups(i)%radius = radius(i)
	460	ENDDO
	461
	462	!
[1359]	463	!-- Set a seed value for the random number generator to be exclusively
	464	!-- used for the particle code. The generated random numbers should be
	465	!-- different on the different PEs.
	466	iran_part = iran_part + myid
	467
[1725]	468	CALL lpm_create_particle (PHASE_INIT)
	469
[1359]	470	!
	471	!-- User modification of initial particles
	472	CALL user_lpm_init
	473
	474	!
	475	!-- Open file for statistical informations about particle conditions
	476	IF ( write_particle_statistics ) THEN
	477	CALL check_open( 80 )
	478	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
	479	number_of_particles, &
	480	maximum_number_of_particles
	481	CALL close_file( 80 )
	482	ENDIF
	483
	484	ENDIF
	485
	486	!
	487	!-- To avoid programm abort, assign particles array to the local version of
	488	!-- first grid cell
	489	number_of_particles = prt_count(nzb+1,nys,nxl)
	490	particles => grid_particles(nzb+1,nys,nxl)%particles(1:number_of_particles)
	491
	492	!
	493	!-- Formats
	494	8000 FORMAT (I6,1X,F7.2,4X,I10,71X,I10)
	495
	496	END SUBROUTINE lpm_init
	497
[1682]	498	!------------------------------------------------------------------------------!
	499	! Description:
	500	! ------------
	501	!> @todo Missing subroutine description.
	502	!------------------------------------------------------------------------------!
[1359]	503	SUBROUTINE lpm_create_particle (phase)
	504
	505	USE lpm_exchange_horiz_mod, &
	506	ONLY: lpm_exchange_horiz, lpm_move_particle, realloc_particles_array
	507
	508	USE lpm_pack_arrays_mod, &
	509	ONLY: lpm_pack_all_arrays
	510
	511	IMPLICIT NONE
	512
[1682]	513	INTEGER(iwp) :: alloc_size !<
	514	INTEGER(iwp) :: i !<
	515	INTEGER(iwp) :: ip !<
	516	INTEGER(iwp) :: j !<
	517	INTEGER(iwp) :: jp !<
	518	INTEGER(iwp) :: kp !<
	519	INTEGER(iwp) :: loop_stride !<
	520	INTEGER(iwp) :: n !<
	521	INTEGER(iwp) :: new_size !<
[1359]	522
[1682]	523	INTEGER(iwp), INTENT(IN) :: phase !<
[1359]	524
[1682]	525	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_count !<
	526	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_start !<
[1359]	527
[1682]	528	LOGICAL :: first_stride !<
[1359]	529
[1682]	530	REAL(wp) :: pos_x !<
	531	REAL(wp) :: pos_y !<
	532	REAL(wp) :: pos_z !<
[1359]	533
[1682]	534	TYPE(particle_type),TARGET :: tmp_particle !<
[1359]	535
	536	!
	537	!-- Calculate particle positions and store particle attributes, if
	538	!-- particle is situated on this PE
	539	DO loop_stride = 1, 2
	540	first_stride = (loop_stride == 1)
	541	IF ( first_stride ) THEN
	542	local_count = 0 ! count number of particles
	543	ELSE
	544	local_count = prt_count ! Start address of new particles
	545	ENDIF
	546
[1]	547	n = 0
	548	DO i = 1, number_of_particle_groups
	549
	550	pos_z = psb(i)
	551
	552	DO WHILE ( pos_z <= pst(i) )
	553
	554	pos_y = pss(i)
	555
	556	DO WHILE ( pos_y <= psn(i) )
	557
[1359]	558	IF ( pos_y >= ( nys - 0.5_wp ) * dy .AND. &
	559	pos_y < ( nyn + 0.5_wp ) * dy ) THEN
[1]	560
	561	pos_x = psl(i)
	562
[1575]	563	xloop: DO WHILE ( pos_x <= psr(i) )
[1]	564
[1359]	565	IF ( pos_x >= ( nxl - 0.5_wp ) * dx .AND. &
	566	pos_x < ( nxr + 0.5_wp ) * dx ) THEN
[1]	567
	568	DO j = 1, particles_per_point
	569
	570	n = n + 1
[1359]	571	tmp_particle%x = pos_x
	572	tmp_particle%y = pos_y
	573	tmp_particle%z = pos_z
	574	tmp_particle%age = 0.0_wp
	575	tmp_particle%age_m = 0.0_wp
	576	tmp_particle%dt_sum = 0.0_wp
[1822]	577	tmp_particle%dvrp_psize = 0.0_wp !unused
[1359]	578	tmp_particle%e_m = 0.0_wp
[824]	579	IF ( curvature_solution_effects ) THEN
	580	!
	581	!-- Initial values (internal timesteps, derivative)
	582	!-- for Rosenbrock method
[1359]	583	tmp_particle%rvar1 = 1.0E-12_wp
	584	tmp_particle%rvar2 = 1.0E-3_wp
	585	tmp_particle%rvar3 = -9999999.9_wp
[824]	586	ELSE
	587	!
	588	!-- Initial values for SGS velocities
[1359]	589	tmp_particle%rvar1 = 0.0_wp
	590	tmp_particle%rvar2 = 0.0_wp
	591	tmp_particle%rvar3 = 0.0_wp
[824]	592	ENDIF
[1359]	593	tmp_particle%speed_x = 0.0_wp
	594	tmp_particle%speed_y = 0.0_wp
	595	tmp_particle%speed_z = 0.0_wp
	596	tmp_particle%origin_x = pos_x
	597	tmp_particle%origin_y = pos_y
	598	tmp_particle%origin_z = pos_z
	599	tmp_particle%radius = particle_groups(i)%radius
	600	tmp_particle%weight_factor = initial_weighting_factor
	601	tmp_particle%class = 1
	602	tmp_particle%group = i
[1822]	603	tmp_particle%tailpoints = 0 !unused
[1359]	604	tmp_particle%particle_mask = .TRUE.
[1822]	605	tmp_particle%tail_id = 0 !unused
	606
[1]	607	!
[1575]	608	!-- Determine the grid indices of the particle position
[1359]	609	ip = ( tmp_particle%x + 0.5_wp * dx ) * ddx
	610	jp = ( tmp_particle%y + 0.5_wp * dy ) * ddy
[1685]	611	kp = tmp_particle%z / dz + 1 + offset_ocean_nzt
[1]	612
[1575]	613	IF ( seed_follows_topography ) THEN
	614	!
	615	!-- Particle height is given relative to topography
	616	kp = kp + nzb_w_inner(jp,ip)
	617	tmp_particle%z = tmp_particle%z + zw(kp)
	618	IF ( kp > nzt ) THEN
	619	pos_x = pos_x + pdx(i)
	620	CYCLE xloop
	621	ENDIF
	622	ENDIF
	623
[1359]	624	local_count(kp,jp,ip) = local_count(kp,jp,ip) + 1
	625	IF ( .NOT. first_stride ) THEN
	626	IF ( ip < nxl .OR. jp < nys .OR. kp < nzb+1 ) THEN
	627	write(6,*) 'xl ',ip,jp,kp,nxl,nys,nzb+1
	628	ENDIF
	629	IF ( ip > nxr .OR. jp > nyn .OR. kp > nzt ) THEN
	630	write(6,*) 'xu ',ip,jp,kp,nxr,nyn,nzt
	631	ENDIF
	632	grid_particles(kp,jp,ip)%particles(local_count(kp,jp,ip)) = tmp_particle
	633	ENDIF
[1]	634	ENDDO
	635
	636	ENDIF
	637
	638	pos_x = pos_x + pdx(i)
	639
[1575]	640	ENDDO xloop
[1]	641
	642	ENDIF
	643
	644	pos_y = pos_y + pdy(i)
	645
	646	ENDDO
	647
	648	pos_z = pos_z + pdz(i)
	649
	650	ENDDO
	651
	652	ENDDO
	653
[1359]	654	IF ( first_stride ) THEN
	655	DO ip = nxl, nxr
	656	DO jp = nys, nyn
	657	DO kp = nzb+1, nzt
	658	IF ( phase == PHASE_INIT ) THEN
	659	IF ( local_count(kp,jp,ip) > 0 ) THEN
	660	alloc_size = MAX( INT( local_count(kp,jp,ip) * &
	661	( 1.0_wp + alloc_factor / 100.0_wp ) ), &
	662	min_nr_particle )
	663	ELSE
	664	alloc_size = min_nr_particle
	665	ENDIF
	666	ALLOCATE(grid_particles(kp,jp,ip)%particles(1:alloc_size))
	667	DO n = 1, alloc_size
	668	grid_particles(kp,jp,ip)%particles(n) = zero_particle
	669	ENDDO
	670	ELSEIF ( phase == PHASE_RELEASE ) THEN
	671	IF ( local_count(kp,jp,ip) > 0 ) THEN
	672	new_size = local_count(kp,jp,ip) + prt_count(kp,jp,ip)
	673	alloc_size = MAX( INT( new_size * ( 1.0_wp + &
	674	alloc_factor / 100.0_wp ) ), min_nr_particle )
	675	IF( alloc_size > SIZE( grid_particles(kp,jp,ip)%particles) ) THEN
	676	CALL realloc_particles_array(ip,jp,kp,alloc_size)
	677	ENDIF
	678	ENDIF
	679	ENDIF
	680	ENDDO
	681	ENDDO
	682	ENDDO
	683	ENDIF
	684	ENDDO
[1]	685
[1359]	686	local_start = prt_count+1
	687	prt_count = local_count
[1]	688	!
[1359]	689	!-- Add random fluctuation to particle positions
	690	IF ( random_start_position ) THEN
	691	DO ip = nxl, nxr
	692	DO jp = nys, nyn
	693	DO kp = nzb+1, nzt
	694	number_of_particles = prt_count(kp,jp,ip)
	695	IF ( number_of_particles <= 0 ) CYCLE
	696	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
[1]	697
[1359]	698	DO n = local_start(kp,jp,ip), number_of_particles !Move only new particles
	699	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
	700	particles(n)%x = particles(n)%x + &
	701	( random_function( iran_part ) - 0.5_wp ) * &
	702	pdx(particles(n)%group)
	703	ENDIF
	704	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
	705	particles(n)%y = particles(n)%y + &
	706	( random_function( iran_part ) - 0.5_wp ) * &
	707	pdy(particles(n)%group)
	708	ENDIF
	709	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
	710	particles(n)%z = particles(n)%z + &
	711	( random_function( iran_part ) - 0.5_wp ) * &
	712	pdz(particles(n)%group)
	713	ENDIF
	714	ENDDO
[1]	715	!
[1359]	716	!-- Identify particles located outside the model domain
	717	CALL lpm_boundary_conds( 'bottom/top' )
	718	ENDDO
	719	ENDDO
	720	ENDDO
[1]	721	!
[1359]	722	!-- Exchange particles between grid cells and processors
	723	CALL lpm_move_particle
	724	CALL lpm_exchange_horiz
[1]	725
[1359]	726	ENDIF
[1]	727	!
[1359]	728	!-- In case of random_start_position, delete particles identified by
	729	!-- lpm_exchange_horiz and lpm_boundary_conds. Then sort particles into blocks,
	730	!-- which is needed for a fast interpolation of the LES fields on the particle
	731	!-- position.
	732	CALL lpm_pack_all_arrays
[1]	733
	734	!
[1359]	735	!-- Determine maximum number of particles (i.e., all possible particles that
	736	!-- have been allocated) and the current number of particles
	737	DO ip = nxl, nxr
	738	DO jp = nys, nyn
	739	DO kp = nzb+1, nzt
	740	maximum_number_of_particles = maximum_number_of_particles &
	741	+ SIZE(grid_particles(kp,jp,ip)%particles)
	742	number_of_particles = number_of_particles &
	743	+ prt_count(kp,jp,ip)
[1]	744	ENDDO
[1359]	745	ENDDO
	746	ENDDO
[1]	747	!
[1822]	748	!-- Calculate the number of particles of the total domain
[1]	749	#if defined( __parallel )
[1359]	750	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
	751	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
	752	MPI_INTEGER, MPI_SUM, comm2d, ierr )
[1]	753	#else
[1359]	754	total_number_of_particles = number_of_particles
[1]	755	#endif
	756
[1359]	757	RETURN
[1]	758
[1359]	759	END SUBROUTINE lpm_create_particle
[336]	760
[1359]	761	END MODULE lpm_init_mod

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